I always enjoy reviving dead threads, so I was after some advice. I got the IHS off easily with razor blades and a butane torch. But my core is covered in solder and i'm not sure of the best way to get it off now that it's hardened... seems like a stupid question, but i don't want to heat the core directly.

it's flat, but not smoothe a lot of biggish ridges in the solder...

Any great ideas to remove the solder? next time I will try to use a razor on the core when it's hot, but i don't have a clamp so a little tricky.

thanks!